Distribution spatiale des O3, NOx et SO2 et évaluation des interactions troposphériques sur la ville de Tunis (Tunisie)

Abstract

Cette étude évalue la pollution urbaine en O 3 , NO x et SO 2 et les interactions locales avec les paramètres météorologiques de la capitale Tunis (Tunisie) entre 2003 et 2014. Elle permet d'établir des cartes de la distribution de la pollution gazeuse puis, par une approche statistique d'étude de la corrélation et d' Analyse en Composantes Principales (ACP), d'établir les interactions existant entre les paramètres météorologiques et les concentrations en ozone et oxydes d'azote. Des concentrations élevées en ozone sont observées sur la zone d'étude (66-130 ppbv), et leur distribution opposée à celle des concentrations en oxydes d'azote et dioxyde de soufre, même si les valeurs de ces derniers ne dépassent pas les normes (respectivement 51-178 ppbv et 1,8-4,4 ppbv). La matrice de corrélation ainsi que l' ACP ont permis de constater une forte corrélation entre l'ozone, la température et l'intensité des radiations solaire, d'une part, et l'humidité relative de l'air et la concentration en monoxyde d'azote, d'autre part, ces deux groupes étant anti-corrélés. Les concentrations en dioxyde d'azote apparaissent ici indépendantes des phénomènes photochimiques et très peu corrélées aux autres paramètres. Mots-cléspollution urbaine, ozone, oxyde d'azote, dioxyde de soufre, acp. AbstractAssessment of urban pollution by O 3 , NO x and SO 2 and local interactions with weather parameters is conducted in the capital Tunis (Tunisia) between 2003 and 2014. It established the distribution maps of the gaseous pollution and highlights the interactions between ozone and nitrogen oxide concentrations as well as meteorological parameters by a statistical approach using correlation studies and principal component analysis (PCA). Quite high ozone concentrations are reported in the study area (66-130 ppbv) and their distribution is the opposite of nitrogen oxides and sulphur dioxide's (respectively 51-178 ppbv et 1,8-4,4 ppbv). The correlation matrix and the PCA show a high correlation between ozone, temperature and the intensity of solar radiations on one side, and relative air humidity and nitrogen monoxide on the other side. These two groups are anti-correlated. Nitrogen dioxide concentrations seem to be independent of the photochemistry with a limited correlation to the other parameters.

Does Temperature Contribute to Environment Degradation? Pakistani Experience Based on Nonlinear Bounds Testing Approach

“…This is due in part to the disruptive factors affecting the environment, which are continually increasing as a result of changes in standard methods of analysis, as well as a lack of data (Rahman, 2017). Kchih et al (2015), for Tunisia, and Lana et al (2016), for Madrid, investigated the dynamics among urban air pollution, and meteorological conditions, modelling a high-resolution hourly data in a regression framework. The author found the temperature to be a less influential factor of air pollution for the given area and time.…”

“…Kchih et al (2015), for Tunisia, and Lana et al (2016), for Madrid, investigated the dynamics among urban air pollution, and meteorological conditions, modelling a high-resolution hourly data in a regression framework. The author found the temperature to be a less influential factor of air pollution for the given area and time.…”

Distribution of Atmospheric Pollution in Southern Benin

“…This is in agreement with the present study which revealed the influence of the city of Cotonou, especially the major intersections, by PM 2.5 and TCOV. This trend is also reported by [4] who showed that the city of Kinshasa in the Democratic Congo is also polluted by NO 2 and CO. [17], while working in the city of Tunis in Tunisia noticed high concentrations of ozone in the study area, and their distribution opposite to that of concentrations of nitrogen oxides and sulfur dioxide, even if the values of the latter do not exceed the standards (respectively. The correlation matrix as well as the PCA made it possible to note a strong correlation between ozone, temperature and the intensity of solar radiation, on the one hand, and the relative humidity of the air and the concentration of nitrogen monoxide, on the other hand, these two groups being anti-correlated.…”